JPS5992723A - Load control system for demand power monitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power demand monitoring device, and relates to a power demand monitoring device (σ1) using a microcomputer system in 9-'J.
Regarding the direct load control method.

A demand controller is known as a load control method for a power demand monitoring device. 1N shows a typical configuration of the demand controller. This has a built-in microprocessor and can receive a pulse input representing t6: force from the outside at one point.

The predicted power is calculated based on the detected power wind, and if this predicted power exceeds the target power, and the difference between the two, the adjusted power, exceeds the power consumption value of the next load to be connected. If there is, perform a shutoff.

When using “-fixed method” as the cutoff method, a
#Fr is shut off according to the destination IPli position, and the machine is moved.

Immediately, in the cut-off mode, the load in the order of priority l is lower than l in the order of upper rzu and negative 1j, and in return mode, the load is
04 is returned with a load of 6'L below. Also r
i) In the case of No. 1, all loads are equally distributed, and the unshut off loads are shut off sequentially in a circular manner so that all loads are at the same rate. Each time the load is released, the load is returned to the ridge in order starting from the load that was cut off at -dark blue 0[1.

However, with the above conventional equipment, as a result of frequent load shedding,
Since only two parameters, the power and the adjusted power, are used, the environment on the negative 7h'j side is ignored. For example, in the case of air conditioner load, t, J
l,￥ Stopping the cooler even though the internal temperature v is high, or conversely continuing operation even though the indoor temperature is low1~
There are some drawbacks. In addition, in the case of a load in a manufacturing factory where the second priority is set in advance (fixed), only the load with a low priority for interruption will frequently be interrupted and restored, resulting in a poor load factor. There is a drawback.

How to monitor demand power and improve load factor and power factor at the same time?
It is necessary to reduce the loss of IC power, lower the voltage fluctuation rate, and lower the electricity interest rate.

Therefore, in addition to monitoring the power demand, the present invention eliminates the two drawbacks by controlling the load by taking into consideration not only the target power and adjusted power, but also the state of the load, the environment, etc. Power monitoring device 1. RF load: It is characterized by providing JI control method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

An example is shown in FIG. In FIG. 2, 1 is a microcomputer subsystem. A predicted power calculation unit 4 is connected to this system 1.
calculates the predicted power of each circuit based on the pulse output from a precision wattmeter with transmitter provided for each circuit, and sends the result to the predicted power analysis section of the microcomputer Sub/Stem. Analysis part d, data setting part 1
Analysis of predicted power is performed based on the demand data set value from. As a demand data setting value, for example, d:, C (power value (desired power value for all loads, usually,
In order to prevent unstable operation with respect to the power value of 1t11 at the beginning of the time limit, the cut-off power value is set for each circuit. The information includes the initial power value to be set, the priority order of shutoff of each load, etc.

The sub7 stem 1 has a pre-6111 power calculation part 11 and an external iτ1-human power calculation part 6. In addition to '11L power output, this external input calculation unit 6 also contains various information such as the status of each load or U
'1 (9 natural parameters representing boundaries can be input.

In an example shown in FIG. 2, a power counter 7 for each load, a counter 8 for dividing the number of interruptions for multiple loads, and a set indoor temperature for each air conditioner when the air conditioner load is included are detected. - An indoor temperature sensor 9 and a power factor reducer 10 for detecting the power factor of each load are connected to the external input calculation section 6.

The external input calculation section 6 calculates various input data from the outside based on various setting values from the data setting section 2. The setting values of data setting 1KIX input to the calculation unit 6 include temperature (if there is an air conditioner load), cutoff circuit, load factor,
Regarding power factor alarm levels, etc., there are "T film formation constant values, etc."

The microcomputer subsystem 1 controls the switching on and off of phase advance capacitors for shutting off and restoring various load circuits and improving the power factor based on the processing outputs of the predictive power analysis section and the external input calculation section B. Equipped with a long load control section 11,
The load control section 11 sends its control output to the interception contact section 16 of each load and associated phase advance capacitor.

Processing 2 in microcomputer subsystem 1, F-
Evening is evening H? lS logging tie 7" to writer 12"]
Various measured values 2. Data can be recorded.

The implementation device with the above configuration uses the following load control method.
Use ψ.

(1) If the load shedding is cyclical (for example, an air conditioner), and the predicted power exceeds the target power (block 602, FIG. 6), it is first determined whether it can be compensated for by power factor improvement (block 315).
), if the time is met, outputs a power factor improvement command to the load that requires power factor improvement (Glock 316); if the time is not met, outputs the power factor improvement command to the load that needs to be shut down most (e.g. Gives a shutdown command to the circuit of the air conditioner with the lowest temperature. or,
For recovery, the circuit of the air conditioner with high temperature is used for recovery (the grogram is not shown in the figure).

(2) When load shedding is identified (e.g., in a manufacturing factory), the predicted power trend is monitored for each circuit, and if the load shedding exceeds the power assigned to each circuit, the load is immediately Block o6) to judge whether the load is at the lowest priority f\l for shutoff, and if not, check whether the power factor correction can be compensated for by DJ function or not.If possible, block that 1'L load A power factor improvement command is issued to the load (block 308), and if the priority of the load in excess of cut-off power is not the lowest f゜, it is determined whether or not the lowest load can be compensated for by power factor improvement (block 309). ), if possible, issue a power factor improvement command (block 14); if not, determine whether the number of times the load is interrupted is greater than the set number (block 31).
U), if it is not large, issue a west cut command for that load (Block 1); if it is large, then in order of priority (', 'For the load one above L (Block 11), improve the power factor of that load (block 312) to determine whether compensation is possible.
If possible, issue a power factor improvement command (block 14), and if not, check the number of interruptions, and repeat the following steps in order to perform power factor improvement as long as it can be compensated for by power factor improvement. However, if this is not possible, in d4, load shedding is performed in which the number of shedding cycles is equal to or less than the allowable set number of times.

As explained above, according to the present invention, the load environment or the load As long as it is possible to control the load according to the degree of importance, and as long as power factor improvement can compensate the predicted power to below the target power, control will be performed to perform power factor improvement.Therefore, 'load factor,'
4ka4- It is possible to improve the power factor, reduce power loss, and make effective use of power.

Note that it is of course possible to use random parameters other than the plant opening side parameters exemplified in the embodiment.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional system, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG.・It is. ! 1 person Fuji Electric Manufacturing Co., Ltd. Fuji Facom Control Co., Ltd. C 4 length 1 ÷ 115 7j Figure 2

Claims (1)

[Claims] Ll′,! Load of power requirement monitoring device j171. l(a)
In method 1, the predicted power of each load is calculated and analyzed, and the situation of each load j is grasped using the environmental parameters of each load, and the predicted power exceeds the same power "J, l:
To the extent that fjjA can be compensated for by power factor improvement, a power factor improvement command is issued to compensate for the occurrence of fjjA, and if it is not possible, Tsukuda II:;
j: A load control method for a demand power monitoring device in which a load shedding command is issued based on the l/S situation.)